What three groups were denied citizenship in ancient greece

women, under age 18, those not born to Athenian citizens

Explanation:

One male citizens could be involved in the goverment of ancient athens.  Had to be 18 and born to parents who were Athenian citizens

it is relaxation hope this

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering